n. someone who vouches for another or for the correctness of a statement
n. a document that serves as evidence of some expenditure
n. 证人, 保证人, 证明者, 凭证, 凭单
vt. 证实...的可靠性
1. You can use this voucher to get a discount on your next purchase.
你可以使用这个代金券在下次购物时获得折扣。
2. I received a gift voucher for my birthday, which I used to buy a new book.
我收到了一个生日礼品券，用来买一本新书。
3. Make sure to check the expiration date on the voucher before using it.
使用之前一定要检查代金券的有效期。